1 /* 2 * Copyright (C) 2012 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.example.android.supportv4.app; 18 19 import android.support.v4.app.FragmentActivity; 20 import android.support.v4.app.FragmentManager; 21 import android.support.v4.app.ListFragment; 22 import android.support.v4.app.LoaderManager; 23 import android.support.v4.content.CursorLoader; 24 import android.support.v4.content.Loader; 25 import android.support.v4.view.MenuItemCompat; 26 import android.support.v4.widget.SearchViewCompat; 27 import android.support.v4.widget.SearchViewCompat.OnQueryTextListenerCompat; 28 import android.support.v4.widget.SimpleCursorAdapter; 29 30 import android.database.Cursor; 31 import android.net.Uri; 32 import android.os.Bundle; 33 import android.provider.BaseColumns; 34 import android.provider.Contacts.People; 35 import android.text.TextUtils; 36 import android.util.Log; 37 import android.view.Menu; 38 import android.view.MenuInflater; 39 import android.view.MenuItem; 40 import android.view.View; 41 import android.widget.ListView; 42 43 /** 44 * Demonstration of the use of a CursorLoader to load and display contacts 45 * data in a fragment. 46 */ 47 @SuppressWarnings("all") 48 public class LoaderRetainedSupport extends FragmentActivity { 49 50 @Override 51 protected void onCreate(Bundle savedInstanceState) { 52 super.onCreate(savedInstanceState); 53 54 FragmentManager fm = getSupportFragmentManager(); 55 56 // Create the list fragment and add it as our sole content. 57 if (fm.findFragmentById(android.R.id.content) == null) { 58 CursorLoaderListFragment list = new CursorLoaderListFragment(); 59 fm.beginTransaction().add(android.R.id.content, list).commit(); 60 } 61 } 62 63 //BEGIN_INCLUDE(fragment_cursor) 64 public static class CursorLoaderListFragment extends ListFragment 65 implements LoaderManager.LoaderCallbacks<Cursor> { 66 67 // This is the Adapter being used to display the list's data. 68 SimpleCursorAdapter mAdapter; 69 70 // If non-null, this is the current filter the user has provided. 71 String mCurFilter; 72 73 @Override public void onActivityCreated(Bundle savedInstanceState) { 74 super.onActivityCreated(savedInstanceState); 75 76 // In this sample we are going to use a retained fragment. 77 setRetainInstance(true); 78 79 // Give some text to display if there is no data. In a real 80 // application this would come from a resource. 81 setEmptyText("No phone numbers"); 82 83 // We have a menu item to show in action bar. 84 setHasOptionsMenu(true); 85 86 // Create an empty adapter we will use to display the loaded data. 87 mAdapter = new SimpleCursorAdapter(getActivity(), 88 android.R.layout.simple_list_item_1, null, 89 new String[] { People.DISPLAY_NAME }, 90 new int[] { android.R.id.text1}, 0); 91 setListAdapter(mAdapter); 92 93 // Start out with a progress indicator. 94 setListShown(false); 95 96 // Prepare the loader. Either re-connect with an existing one, 97 // or start a new one. 98 getLoaderManager().initLoader(0, null, this); 99 } 100 101 @Override public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) { 102 // Place an action bar item for searching. 103 MenuItem item = menu.add("Search"); 104 item.setIcon(android.R.drawable.ic_menu_search); 105 MenuItemCompat.setShowAsAction(item, MenuItemCompat.SHOW_AS_ACTION_ALWAYS 106 | MenuItemCompat.SHOW_AS_ACTION_COLLAPSE_ACTION_VIEW); 107 View searchView = SearchViewCompat.newSearchView(getActivity()); 108 if (searchView != null) { 109 SearchViewCompat.setOnQueryTextListener(searchView, 110 new OnQueryTextListenerCompat() { 111 @Override 112 public boolean onQueryTextChange(String newText) { 113 // Called when the action bar search text has changed. Update 114 // the search filter, and restart the loader to do a new query 115 // with this filter. 116 String newFilter = !TextUtils.isEmpty(newText) ? newText : null; 117 // Don't do anything if the filter hasn't actually changed. 118 // Prevents restarting the loader when restoring state. 119 if (mCurFilter == null && newFilter == null) { 120 return true; 121 } 122 if (mCurFilter != null && mCurFilter.equals(newFilter)) { 123 return true; 124 } 125 mCurFilter = newFilter; 126 getLoaderManager().restartLoader(0, null, CursorLoaderListFragment.this); 127 return true; 128 } 129 }); 130 MenuItemCompat.setActionView(item, searchView); 131 } 132 } 133 134 @Override public void onListItemClick(ListView l, View v, int position, long id) { 135 // Insert desired behavior here. 136 Log.i("FragmentComplexList", "Item clicked: " + id); 137 } 138 139 // These are the Contacts rows that we will retrieve. 140 static final String[] CONTACTS_SUMMARY_PROJECTION = new String[] { 141 People._ID, 142 People.DISPLAY_NAME, 143 }; 144 145 public Loader<Cursor> onCreateLoader(int id, Bundle args) { 146 // This is called when a new Loader needs to be created. This 147 // sample only has one Loader, so we don't care about the ID. 148 // First, pick the base URI to use depending on whether we are 149 // currently filtering. 150 Uri baseUri; 151 if (mCurFilter != null) { 152 baseUri = Uri.withAppendedPath(People.CONTENT_FILTER_URI, Uri.encode(mCurFilter)); 153 } else { 154 baseUri = People.CONTENT_URI; 155 } 156 157 // Now create and return a CursorLoader that will take care of 158 // creating a Cursor for the data being displayed. 159 String select = "((" + People.DISPLAY_NAME + " NOTNULL) AND (" 160 + People.DISPLAY_NAME + " != '' ))"; 161 return new CursorLoader(getActivity(), baseUri, 162 CONTACTS_SUMMARY_PROJECTION, select, null, 163 People.DISPLAY_NAME + " COLLATE LOCALIZED ASC"); 164 } 165 166 public void onLoadFinished(Loader<Cursor> loader, Cursor data) { 167 // Swap the new cursor in. (The framework will take care of closing the 168 // old cursor once we return.) 169 mAdapter.swapCursor(data); 170 171 // The list should now be shown. 172 if (isResumed()) { 173 setListShown(true); 174 } else { 175 setListShownNoAnimation(true); 176 } 177 } 178 179 public void onLoaderReset(Loader<Cursor> loader) { 180 // This is called when the last Cursor provided to onLoadFinished() 181 // above is about to be closed. We need to make sure we are no 182 // longer using it. 183 mAdapter.swapCursor(null); 184 } 185 } 186 //END_INCLUDE(fragment_cursor) 187 } 188
